Method for Driving Liquid Crystal Display

1. A method for driving a liquid crystal display (LCD), the LCD comprising a common electrode, a pixel electrode, a liquid crystal layer located between the common electrode and the pixel electrode, the liquid crystal layer having a plurality of impurity ions and a pixel utilized for displaying a gray scale, characterized in that the method comprises steps of: separating the impurity ions toward the common electrode and the pixel electrode to form an internal electric field in the liquid crystal layer; and providing a compensated common voltage for the common electrode, and providing a first pixel voltage and a second pixel voltage for the pixel electrode according to the gray scale, wherein the compensated common voltage is utilized to compensate the internal electric field so that a difference between the first pixel voltage and the compensated common voltage is equal to a difference between the second pixel voltage and the compensated common voltage; wherein the step of separating the impurity ions is done by providing an offset common voltage at the common electrode, and providing a first voltage and a second voltage at the pixel electrode so that a difference between the first voltage and the offset common voltage is unequal to a difference between the second voltage and the offset common voltage.

2. The method for driving the LCD according to claim 1 , characterized in that the step of separating the impurity ions is done by providing an offset common voltage at the common electrode, and providing a first voltage and a second voltage at the pixel electrode so that a difference between the first voltage and the offset common voltage is unequal to a difference between the second voltage relative to the offset common voltage.

3. The method for driving the LCD according to claim 2 , characterized in that the second voltage is larger than the first voltage, and the offset common voltage is between the first voltage and the second voltage, and the difference between the offset common voltage and the first voltage is larger than the difference between the offset common voltage and the second voltage, and then the compensated common voltage is a common voltage plus the internal voltage.

4. The method for driving the LCD according to claim 2 , characterized in that the second voltage is larger than the first voltage, and the offset common voltage is between the first voltage and the second voltage, and the difference between the offset common voltage and the first voltage is less than the difference between the offset common voltage and the second voltage, and then the compensated common voltage is a common voltage minus the internal voltage.

5. The method for driving the LCD according to claim 2 , characterized in that the compensated common voltage is adjusted by using resistors or a digital-to-analog converter integrated circuit.

6. A method for driving a liquid crystal display (LCD), the LCD comprising a common electrode, a pixel electrode, a liquid crystal layer located between the common electrode and the pixel electrode, the liquid crystal layer having a plurality of impurity ions and a pixel utilized for displaying a gray scale, characterized in that the method comprises steps of: separating the impurity ions toward the common electrode and the pixel electrode to form an internal electric field in the liquid crystal layer; and providing a common voltage for the common electrode, and providing a first compensation voltage and a second compensation voltage for the pixel electrode according to the gray scale, wherein the first compensation voltage and the second compensation voltage are utilized to compensate the internal electric field so that a difference between the first compensation voltage and the common voltage is equal to a difference between the second compensation voltage and the common voltage; wherein the step of separating the impurity ions is done by providing an offset common voltage at the common electrode, and providing a first voltage and a second voltage at the pixel electrode so that a difference between the first voltage and the offset common voltage is unequal to a difference between the second voltage and the offset common voltage.

7. The method for driving the LCD according to claim 6 , characterized in that the second voltage is larger than the first voltage, and the offset common voltage is between the first voltage and the second voltage.

8. The method for driving the LCD according to claim 7 , characterized in that the difference between the offset common voltage and the first voltage is larger than the difference between the offset common voltage and the second voltage.

9. The method for driving the LCD according to claim 8 , characterized in that a direction of the internal electric field is toward the common electrode from the pixel electrode.

10. The method for driving the LCD according to claim 9 , characterized in that the first compensation voltage is a first pixel voltage minus a voltage value of the internal electric field, and the second compensation voltage is a second pixel voltage minus the voltage value of the internal electric field.

11. The method for driving the LCD according to claim 7 , characterized in that the difference between the offset common voltage and the first voltage is less than the difference between the offset common voltage and the second voltage.

12. The method for driving the LCD according to claim 11 , characterized in that a direction of the internal electric field is toward the pixel electrode from the common electrode.

13. The method for driving the LCD according to claim 12 , characterized in that the first compensation voltage is a first pixel voltage plus a voltage value of the internal electric field, and the second compensation voltage is a second pixel voltage plus the voltage value of the internal electric field.

14. The method for driving the LCD according to claim 6 , characterized in that the first compensation voltage and second compensation voltage are adjusted by using resistors or a digital-to-analog converter integrated circuit.